EP2443162A1 - Copolycondensation polymerization of fluoropolymers - Google Patents
Copolycondensation polymerization of fluoropolymersInfo
- Publication number
- EP2443162A1 EP2443162A1 EP10789892A EP10789892A EP2443162A1 EP 2443162 A1 EP2443162 A1 EP 2443162A1 EP 10789892 A EP10789892 A EP 10789892A EP 10789892 A EP10789892 A EP 10789892A EP 2443162 A1 EP2443162 A1 EP 2443162A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oligomer
- group
- ppm
- compound
- units
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/08—Polyhydrazides; Polytriazoles; Polyaminotriazoles; Polyoxadiazoles
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F214/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
- C08F214/18—Monomers containing fluorine
- C08F214/22—Vinylidene fluoride
- C08F214/222—Vinylidene fluoride with fluorinated vinyl ethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/30—Introducing nitrogen atoms or nitrogen-containing groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2800/00—Copolymer characterised by the proportions of the comonomers expressed
- C08F2800/10—Copolymer characterised by the proportions of the comonomers expressed as molar percentages
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2810/00—Chemical modification of a polymer
- C08F2810/40—Chemical modification of a polymer taking place solely at one end or both ends of the polymer backbone, i.e. not in the side or lateral chains
Definitions
- Fluoropolymers are typically manufactured in a free radical emulsion, solution or suspension polymerization process from fluorooiefins and fiuorovinyl ethers.
- the types of fluoropolymers that have been made are thus limited to those that can be manufactured by such processes.
- the 1 ,3-dtpolar cycloaddJtion between an azide and an alkyne to result in a 1 ,2,3-triazole is referred to as the Huisgen reaction, The reaction is among those also referred to as "Click Chemistry" H. C. KoIb. M. G. Finn and K. B. Sharpless Angewandte Chemie International Edition 40( 11 ), 2004-2021 (2001 ).
- the present invention is a new copolycondensation polymerization process for the manufacture of fluorinated copolymers. Accordingly an aspect of the present invention is a process for the manufacture of fluorinated copolymers comprising:
- R is selected from the group consisting of i) a C 3 ⁇ C10 fiuoroalkylene group, ii) a C 3 - C 10 fluoroalkoxylene group, iii) a substituted aryl group, iv) an oligomer comprising copoiymerized units of vinyiidene fluoride and perfluoro(methyl vinyl ether), v) an oligomer comprising copoiymerized units of vinyiidene fluoride and hexafluoropropylene, vi) an oligomer comprising copoiymerized units of tetrafluoroethyiene and perf!uoro ⁇ methyl vinyl ether), and vii) an oligomer comprising copotymerized units of tetrafluoroethyiene and a hydrocarbon olefin; C) adding to the reactor a tele
- the present invention ⁇ s directed to a copolycondensation polymerization process for the manufacture of fluorinated copolymers.
- copolycondensation condensation between reactants leading to new products.
- a telecheiic fluorinated bisazido compound is reacted with a telecheiic diyne or dinitrile (dicyano) compound in the presence of a copper(l) halide catalyst.
- the copper(l) halide may be generated in-situ by reaction of a copper(il) halide with a reducing agent such as ascorbic acid.
- the polymerization medium is a nitrogen-based ligand such as a bidentate nitrogen complexing agent (e.g. 2,2'-bipyrjdine), hexamethylene tetramine, 2-pyrtdinecarbaldehyde alkylimine, muttidendate linear poiyamines, 1 ,10-phenanthroiine, and 1 , 1 ,4,7, 1O 1 10-hexamethyltriethylenetetramine.
- a bidentate nitrogen complexing agent e.g. 2,2'-bipyrjdine
- oligomers i.e. low molecular weight copolymers
- VF 2 or TFE is iodine transfer copolymerized in the presence of 1-(CF 2 ) 4 -I.
- the resulting copolymers are then ethylenated and eventually reacted with Nalsb to yield the diazide telechelic oligomers.
- Such oligomers preferably contain 10 to 60 mole percent perfluoro(methyl vinyl ether).
- the oligomers have a number average molecular weight of 1000 to 25,000, preferably 1200 to 12,000, most preferably 1500 to 5000,
- Telecheltc diyne or di ⁇ it ⁇ le (di ⁇ ya ⁇ o) compounds that may be employed in the process of this invention include, but are not limited to NC-(CF 2 )n ⁇ CN (n - 2-20), see US 2,515,246 and Journal of Industrial and Engineering Chemistry (Washington, D.
- the polymerization reaction may be run at a temperature between 15°C and 100°C (preferably between 20°C and 80°C) and at a pressure between 0.1 and 7 MPa (preferably between 0.1 and 0.7 MPa).
- R is the same as that defined in the telechelic fiuorinated bisazido compound formula.
- CuBr is shown as the catalyst in the above reaction, any co ⁇ per(l) halide may be employed.
- Copolymers made by the copolycondensation process of this invention have a number average molecular weight between 5000 and 200,000, preferably 10,000 to 100,000, These copolymers are useful in many industrial applications including sealants, O-rings, shaft seals for use in the automotive, aerospace and the electronics industries.
- the experimental conditions for 1 H (or 19 F) NMR spectra were the following: flip angle 90 ° (or 30 °), acquisition time 4,5 s (or 0.7 s) . pulse delay 2 s (or 5 s) , number of scans 16 (or 128), and a pulse width of 5 ⁇ s for 19 F NMR.
- SEC Size Exclusion Chromatography
- T g glass transition temperatures
- TGA analyses were performed using a Texas Instrument ATG 51- 133 apparatus under air at the heating rate of 20°C/min from room temperature (approximately 20°C) up to 550°C.
- HC-276 Hastelloy (HC-276) autoclave, equipped with inlet and outlet valves, a manometer and a rupture disc, was degassed and pressurized with 3.0 MPa of nitrogen for
- the monomers were introduced by a gas transfer of perfluoro(methyl vinyl ether) (PMVE) (332 g, 2.0 mole) and vinylidene fluoride (VF 2 ) (192 g, 3.0 mole).
- PMVE perfluoro(methyl vinyl ether)
- VF 2 vinylidene fluoride
- the molar ratio VF 2 /PMVE of the feed was 60/40.
- the autoclave was cooled to about -40 °C in a dry ice/acetone bath, A small increase in the reactor pressure was observed (from 0 to 0.2 MPa) during the introduction of PMVE.
- the autoclave was then warmed to room temperature. Pressure in the autoclave increased from 0.2 to 0.5 MPa.
- VF ⁇ was introduced at room temperature.
- the oligomer was characterized by 19 F and 1 H NMR spectroscopy and SEC analysis as described in the Test Methods.
- the number average molecular weight was 2410 g/m ⁇ l (by 19 F NMR); 2765 g/mo! (by SEC) and had a polydispersity index (PDI) of 1.147,
- the composition of the oligomer was 73.4 mol% VF 2 and 26.6 mol% PMVE.
- the glass transition temperature (Tg) was -55°C
- the decomposition temperature (Td) was 220 °C.
- the above oligomer was ethylenated by the following procedure.
- the autoclave was placed in an tee bath for about 60 minutes and 0.5 g of unreacted ethylene was slowly released.
- the reaction mixture was dissolved in 100 ml of 2-butanone (MEK) and washed with distilled water (2 x 100 ml), Na 2 S 2 O 5 solution (100 mt) and brine (100 ml) respectively in a separating funnel.
- MEK 2-butanone
- the organic phase was dried over MgSO 4 and filtered through sintered glass (G4).
- the organic solvent was removed by a rotating vacuum evaporator at 40°C under a vacuum of about 10 mm Hg.
- the resulting slightly yellow viscous liquid was dried at 40°C under 0.01 mbar pressure to constant weight.
- This ethylenated oligomer was then reacted with sodium azide to form the telechelic bis(azido) PoIy(VF 2 -CO-PMVE) copolymer.
- the nucleophilic substitution of 2.03 g (1.3 mmol) of ethylenated diiodo poly(VDF-co-PMVE) oligomer with 2.70 g (4.0 mmol) of sodium azide was carried out in a round bottom flask containing 20 mL of DMSO at 50°C for 12 hours. Then, the diazido dissolved with diethyl ether was precipitated from water, washed 5 times with distilled water and dried over magnesium sulfate.
- the batch bismonoaddition of ⁇ . ⁇ -diiodoperfluorohexane onto ethylene was performed in a 160 mL Hastelloy (HC276) autoclave Parr System, equipped with a manometer, a rupture disk, inlet and outlet valves, and a mechanical anchor. An electronic device regulated and controlled both the stirring and the heating of the autoclave.
- the autoclave was left dosed for 20 min. and purged with 30 bars of nitrogen pressure to prevent any leakage, and degassed afterwards. Then, a 2 mm Hg vacuum was operated for 15 min.
- the initiator di-4-tert- butylcyclohexyl peroxydicarbonate (4.22 g, 10 mmol) and 30,13 g (54.2 mmol) of 1-CeF 52 -I in dry tert-butanol (40 mL) were introduced via a funnel tightly connected to the introduction valve.
- ethylene 4.0 g, 0, 14 mol
- the autoclave was then heated up to 50 c C for 7 hours. After reaction, the autoclave was cooled to room temperature and then put into an ice bath. After degassing the unreacted monomer, the autoclave was opened.
- a mixture comprised of 3.70 g (6.0 mmol) of the UO-ditodo-3- trifluoromethyl-3A4, 5,57,7, 8,8-nonafluorodecane (prepared above) and 1.21 g (18.0 mmol) sodium azide dissolved in DMSO (25 mL) and water (0.5 mL) was stirred at 50°C for 48 hours, Then, the reaction mixture was poured into water and was extracted with diethyl oxide. This procedure was repeated twice.
- Example 1 the process of the invention was employed to manufacture a copolymer of telechelic bis(azido) poly(VF 2 -co-PMVE) copolymer with telechelic ⁇ , ⁇ dtpropargyl ether bisphenol AF.
- a copolymer of telechelic bis(azido) poly(VF 2 -co-PMVE) copolymer with telechelic ⁇ , ⁇ dtpropargyl ether bisphenol AF In a three- necked round bottom flask equipped with a condenser, 47 mg (0.3 mmol) of CuBr, 272 mg of bipyridine and 20 mi of THF were mixed. The mixture was purged with argon for 10 minutes in order to avoid excess oxidation of the Cu(I).
- the process of the invention was employed to manufacture poly( ⁇ , ⁇ ditfiazolo-1 ,10-diazido-3-trifluoromethyl- 3,4,4,5,5,7,7,8,8-nonafluorodecane -co- methyleneetherhexafluorobisphenoi AF) copolymer.
- 1 ,10-diazido-3- trifluoromethyl-3,4,4,5, 5,7,7, 8,8-Nonafluorodecane is sometimes referred to as TFE/VF 2 /HFP.
- Copper bromide 100 mg, 0.66 mmol
- 2,2'-bipyridine dNbipy
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Other Resins Obtained By Reactions Not Involving Carbon-To-Carbon Unsaturated Bonds (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/486,378 US8247614B2 (en) | 2009-06-17 | 2009-06-17 | Copolycondensation polymerization of fluoropolymers |
PCT/US2010/030676 WO2010147696A1 (en) | 2009-06-17 | 2010-04-12 | Copolycondensation polymerization of fluoropolymers |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2443162A1 true EP2443162A1 (en) | 2012-04-25 |
EP2443162A4 EP2443162A4 (en) | 2015-08-26 |
Family
ID=43354895
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10789892.6A Withdrawn EP2443162A4 (en) | 2009-06-17 | 2010-04-12 | Copolycondensation polymerization of fluoropolymers |
Country Status (5)
Country | Link |
---|---|
US (1) | US8247614B2 (en) |
EP (1) | EP2443162A4 (en) |
JP (1) | JP5635084B2 (en) |
CN (1) | CN102612526B (en) |
WO (1) | WO2010147696A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015505885A (en) * | 2011-12-16 | 2015-02-26 | ソルベイ スペシャルティ ポリマーズ イタリー エス.ピー.エー. | Crosslinkable composition based on vinylidene fluoride-trifluoroethylene polymer |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8288482B2 (en) | 2009-06-17 | 2012-10-16 | E I Du Pont De Nemours And Company | Curable fluoroelastomer compositions |
WO2011059994A2 (en) * | 2009-11-11 | 2011-05-19 | 3M Innovative Properties Company | Polymeric compositions and method of making and articles thereof |
US9243170B2 (en) * | 2013-08-26 | 2016-01-26 | Tyco Electronics Corporation | Adhesive manufacturing process, adhesive, and article |
FR3038322B1 (en) * | 2015-07-01 | 2018-10-19 | Universite De Montpellier (Universite Montpellier 2 Sciences Et Techniques) | LOW-THERMOSTABLE AND THERMOSTABLE THERMOSETTING CROSS-LINKABLE MATERIALS BASED ON FLUOROETHERS |
FR3038321B1 (en) * | 2015-07-01 | 2017-06-23 | Labinal Power Systems | THERMOPLASTIC AND LOW THERMOSTABLE THERMOPLASTIC COPOLYMERS BASED ON PERFLUOROETHERS |
JP6907908B2 (en) * | 2017-12-04 | 2021-07-21 | 信越化学工業株式会社 | Azide group-containing fluoropolymer and its production method |
WO2021059981A1 (en) * | 2019-09-26 | 2021-04-01 | ダイキン工業株式会社 | Fluoropolyether group-containing silane compound |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2515246A (en) * | 1946-06-30 | 1950-07-18 | Purdue Research Foundation | Polyfluoro aliphatic diamines |
US3086946A (en) * | 1960-06-06 | 1963-04-23 | Research Corp | Fluoroamidines and condensation products thereof |
US3386968A (en) * | 1962-11-15 | 1968-06-04 | Navy Usa | Tetrazole polymers |
US3347901A (en) * | 1962-11-23 | 1967-10-17 | Du Pont | Perfluorinated monomers |
US4020176A (en) * | 1975-07-14 | 1977-04-26 | Polaroid Corporation | Highly fluorinated diazides and process therefor |
JPS5657811A (en) * | 1979-10-17 | 1981-05-20 | Daikin Ind Ltd | Preparation of liquid fluorine-containing polymer |
IT1213537B (en) * | 1986-11-21 | 1989-12-20 | Ausimont Spa | PROCEDURE FOR THE PREPARATION OF PERFLUOROETERS BY FLUORURATION WITH ELEMENTARY FLUORINE. |
JP2528861B2 (en) * | 1987-03-13 | 1996-08-28 | 株式会社日立製作所 | Fluorine-containing azide compounds |
US6365693B1 (en) | 1999-05-07 | 2002-04-02 | Dupont Dow Elastomers, L.L.C. | Fluoroalkanesulfonyl azide copolymers |
WO2003101972A1 (en) * | 2002-05-30 | 2003-12-11 | The Scripps Research Institute | Copper-catalysed ligation of azides and acetylenes |
US8101238B2 (en) * | 2004-07-22 | 2012-01-24 | The Scripps Research Institute | Polymeric materials via click chemistry |
US7208243B2 (en) * | 2004-12-01 | 2007-04-24 | Toyota Technical Center Usa, Inc. | Proton exchange membranes using cycloaddition reaction between azide and alkyne containing components |
JP2007211060A (en) * | 2006-02-07 | 2007-08-23 | Japan Advanced Institute Of Science & Technology Hokuriku | Supermolecule polymer and its synthetic method |
US20080096819A1 (en) * | 2006-05-02 | 2008-04-24 | Allozyne, Inc. | Amino acid substituted molecules |
WO2007132005A2 (en) * | 2006-05-15 | 2007-11-22 | Rhodia Operations | Hybrid compounds based on polyol(s) and at least one other molecular entity, polymer or otherwise, especially of the polyorganosiloxane type, method for the preparation thereof, and applications of the same |
CN101652405A (en) * | 2006-10-17 | 2010-02-17 | 国家淀粉及化学投资控股公司 | 1 of trinitride and alkynes, the cycloaddition of 3-dipole |
US20090069569A1 (en) * | 2007-09-12 | 2009-03-12 | Institut Catala D'investigacio Quimica | Cycloaddition of azides and alkynes |
JP4873570B2 (en) * | 2007-09-27 | 2012-02-08 | 学校法人日本大学 | POLY [2] CATENAN COMPOUND AND MONOMER THEREOF AND METHOD FOR PRODUCING THEM |
US8288492B2 (en) * | 2007-10-23 | 2012-10-16 | E I Du Pont De Nemours And Company | Difunctional oligomers of perfluoro(methyl vinyl ether) |
US20090326192A1 (en) * | 2008-04-08 | 2009-12-31 | Aileron Therapeutics, Inc. | Biologically active peptidomimetic macrocycles |
US8445601B2 (en) * | 2008-11-14 | 2013-05-21 | 3M Innovative Properties Company | Polymeric compositions and method of making and articles thereof |
-
2009
- 2009-06-17 US US12/486,378 patent/US8247614B2/en not_active Expired - Fee Related
-
2010
- 2010-04-12 JP JP2012516081A patent/JP5635084B2/en not_active Expired - Fee Related
- 2010-04-12 CN CN201080027106.0A patent/CN102612526B/en not_active Expired - Fee Related
- 2010-04-12 EP EP10789892.6A patent/EP2443162A4/en not_active Withdrawn
- 2010-04-12 WO PCT/US2010/030676 patent/WO2010147696A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2010147696A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015505885A (en) * | 2011-12-16 | 2015-02-26 | ソルベイ スペシャルティ ポリマーズ イタリー エス.ピー.エー. | Crosslinkable composition based on vinylidene fluoride-trifluoroethylene polymer |
Also Published As
Publication number | Publication date |
---|---|
WO2010147696A1 (en) | 2010-12-23 |
JP5635084B2 (en) | 2014-12-03 |
US20100324234A1 (en) | 2010-12-23 |
CN102612526A (en) | 2012-07-25 |
US8247614B2 (en) | 2012-08-21 |
CN102612526B (en) | 2015-11-25 |
JP2012530799A (en) | 2012-12-06 |
EP2443162A4 (en) | 2015-08-26 |
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Ipc: C08K 5/28 20060101ALI20150722BHEP Ipc: C08L 27/12 20060101ALI20150722BHEP Ipc: C08K 5/315 20060101ALI20150722BHEP Ipc: C08G 83/00 20060101ALI20150722BHEP Ipc: C08F 214/18 20060101AFI20150722BHEP |
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